Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
The schema already fully documents the only parameter ('id' with a clear source hint 'from list_custom_data'), so the description adds no new parameter-level meaning. The phrase 'by ID' reinforces the schema, but the schema carries the semantic weight, so the baseline score of 3 applies.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.